principal amount

Original sum borrowed

The principal amount is the original sum of money borrowed, invested, or owed—distinct from interest or earnings that accrue over time.

A mortgage's principal is what you borrowed; your monthly payment covers both principal and interest.

In investments, principal is your initial stake before any gains or losses: Don't touch the principal—live off the interest.

Opposites
loan components

principal amountinterest

Attention, stake, or fee

accrued interest · interest charges · interest payment · finance charges · yield

financial priority

principal amountinterest

Attention, stake, or fee

interest payment · accrued interest · finance charges · compound interest · simple interest

Family

amount, principal

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